Paper container



Oct. 12 1926.

A. MOORE PAPER CONTAINER Filed March 23 fa? .Z.

Patented 0a. 12', 1926.

UNITED STATES ARLINGTON MOORE, OF BOSTON, MASSACHUSETTS.

PAPER CONTAINER.

Application filed larch 28, 1921. Serial No.- 454,769.

The present invention relates to paper containers of the general type shown in my pending application Serial No. 336,292, in which a continuation of the side wall is inwardly folded and the folds pressed together under-an extremely high degree of pressure, so that the contacting surfaces cohere and the folds become a practically integral solid mass, thereby providing a container having a neck which is adapted to receive and retain a removable disk closure.

While the form of neck which is composed of-three plies or folds of stock, as described in said prior application, is entirely satisfactory and suitable in many instances, it does not have the strength required for some conditions, particularly for containers of large size, and, in this connection, one of the objects of the invention is to provide a form of paper container which shall have substantially increased strength, as compared with said three-ply construction, so that it will be adapted for conditions for which said con struction is not adapted, and which may be made with no more, or even less, difiiculty than said construction.

In the formation of the connection between the side wall and bottom, or end wall,

the latter, which, in its original form, is a fiat disk, is cupped, or its edge portion is bent through a right angle or more, "to form an edge-flange. This cupping operation causes the stock tobe crimped into folds,

which are pressed to a practically smooth surface, and, as the thickness of the stock must not be permitted to increase, its solidity must be very substantially increased.

In practice, the pressure necessary to form the edge flange in this manner is so great that. both surfaces thereof are calendered to a considerable extent, the outer surface being calendered much more highly than the innor surface, on account of the ironing movement of the forming die. Consequently,

' while the end wall may be, and usually is,

made of uncalendered stock, which is the same as that employed-for the sidewall, yet the flanging, or cupping operation, so solidifies and calenders th'e flange that satisfactory cohesion between the two portions thereof, or

between any portion thereof and a fold ofuncalendered stock, will not be secured, that is, the folds will not cohere in nearly as effective a manner as the will where both ."surfaces are uncalendere The bending over of the edge portion of the flange, to an extent breaks up its calendered surface, so that there is, at the bends,

an increased inter-engagement of the contactlng surfaces, but to a somewhat less degareedthan when both surfaces are uncalenere A further object of the invention is to provide a form of connection between the side and end wall, which will not only be per fectly air and liquid-tight, but which will be so formed that danger of breaking the connection between the folds, by forces tending to distort the same, will be avoided, and a strengthening rib will be formed, whichwill lend great rigidity to the entire container, and in which any failure of the flange surfaces of the end wall to cohere with other surfaces will be fully compensated for.

I accomplish these objects in themanner illustrated in the accompanying drawingin which Fig. 1 is-a view partly in central longitudinal section, and partly in elevation, of an embodiment of the invention.

Fig. 2 is a sectional view of the neck portion on an enlarged scale.

Fig. 3 is a similar view of a modified form of the invention.

' Fig. 4 is an enlarged sectional view of the joint between the bottom and the side wall.

Fig. 5 is an illustrative detail view thereof.

Fig. 6 is a sectional detail view of a modification of the construction shown in Fig. 4.

'VVhile the embodiment of thepresent invention is shown as applied to a firkin of trunco-conical form, and while the invention side wall 1, of uncalendered paper stock, a

bottom 2, and a top or cap 3. The neck of the container is formed from a continuation of the stock of the side wall, which is bent outwardly in a direction nearly parallel to the bottom "and then curved upwardly and flared outwardly, forming an outer fold or neck portion 4. From this point the stock is bent sharply inward, forming a rim portion 5, then reversely to the outer portion, forming an inner fold or neck portion 6, then reversely again at a point at which the bend 7 is flush with the inner surface of the side wall, from which pointit is extended to 1 avoid the exposure of the raw edge, by formtion 17 of the side wall is versely, forming two intervening folds or neck portions 8 and 9, the outermost, 9, of

- which, in this form of the invention, terminates at such a point-that its edge is flush with the inner surface of the side wall.

The four folds, thus arranged, are compressed under a very heavy pressure, so that their engaging surfaces cohere and the folds practically become a homogeneous mass, and, in the molding operation, an annular receiving groove for the ca 3 is formed, providing a cap-seat 10 an a cap-retaining shoulder 11. This strong pressure is applied both transversely and longitudinally of the container, so that the seat portion 10 will be consolidated, as well as the other portions of the neck, and to an extent that the raw edge of the-terminal portion 9 will be unlikely to absorb moisture.

This construction may be modified, to

ing the fold 7 at such a point that the portion 9 will terminate at a sufficient distance from the inner surface of the side wall to permit its end portion to be compressed to a sharp edge, as indicated at 9 in Fig. 3, so that the adjacent surfaces of the portions 4 and 8 will bepressed into cohesive con-.

tact. *The construction shown in Fig. 3 is, otherwise, the same as that shown in Figure 2. Thefour-ply construction thus provided is very materially stronger and more rigid than the prior construction above referred to, and adds greatly to the strength of the container.

In the construction of the joint between the side wall and the bottom, or end wall, the latter is drawn into cup form, to rovide a flange portion 12, which seats against the side wall at a predetermined point and extends outwardly with relation to the containers interior. The end portion of the side wall is folded inward, to form two plies, of a length de ending on the width of bottom rib desire and consisting of a terminal fold 15, and an intermediate fold 16. The side wall continuation and the flange portion are then folded together, so that the fold 16 is pressed against the inner side of the flange portion and the latter is bent about the connecting bend between the folds 15 and 16,"so that the flange terminal portion 13 lies against the fold 15 and extends to an intermediate point therein, approx imately midway thereof. The bottom porpressed flat against the bottom flange portion 14, and the inner fold 18 is pressed against the inner side of theflange terminal portion 13 and against the inner side of the terminal fold 15, above the end of the flange termihal 13, an intermediate shoulder being formed therein which is engaged with the end of the terminal portion 13, while the transverse portion 19, which'connects the folds 16 and tudinally, into the form illustrated in Fig.

4, and, it is to be especially noted, the two folds 15 and 16, throughout the length thereof, and the portion of the inner fold 18, nearest the end wall 2, are pressed into contact, and, as the surfaces thereof are relatively soft and uncalendered, they will 00- here, under the heavy pressure, and become a practically solid integral mass, this condition being illustrated in Fig. 5. That is, a solid core portion which is two-play for 3 about one-half its height, and three-ply for the other half, is provided for the rib, and a three-ply support for the end wall is formed, which, by the longitudinal pressure, is caused to cohere with the portion of the outer surface of the end wall with which it is engaged. A solid support is thus provided for the end wall, through its flange portion 12, the end wall folds 15 and 16, and the abutting flange terminal 13 and inner fold 18, which rest on the bottom portions 14v and 17. When thus folded, the flange terminal is securely interlocked within the folds of the side wall in a manner which will practically prevent breaking apart or separation of the folds from the intimate contact into which they have been pressed, and, even if the cohesion with the flange is imperfect, leakage will be prevented b the (.ohesion of the connecting fold 19, whic is three plies in length, with the end wall 2. In cases where the sizeof the container is particularly great, and the load, on account of the weight of the contents, ,is especially excessive, there will be a strong tendency to bulge out the bottom of the container. This tendency will cause a pulling action from the center of the bottom radially, which will tend to cause, and, if strong enough, will actually cause a separation of the bottom flange portion, at the point when the bottom is bent to form said flan e, and the side wall. As previously explained, the operation of drawing the disk of which the bottom is formed, into cup form, so calenders the flange portion as to prevent satisfactory cohesion, by compression, so that there will be practically but little, or no cohesion between the flange and the side Wall, at the point where the strain, due to the bulging out of the bottom, will be principally applied. Consequently, other portions of the joint must be relied on to resist this strain, the resistance principally effective to this end, in the construction of Fig. 4, being the forces which resist the tendency to distort the rib formed in folding and pressing together the side wa l continuation and the bottom flange, as al--, ready described.

In Fig. 6 a modification of the construction shown in Fig. 4 is illustrated, in which thearrangement is such that strains tending tobulge outthe bottom closure will be more effectively resisted.

In producing this construction, when the bottom is drawn into cup form, the stock is moulded to form an annular head 20 at the inner side thereof, at the point where the stock is bent to form the flange, said bead being approximately semi-circular in crossformed, except that, after the several folds of the side and end wall have been pressed into position against the sidewall, when the longitudinal pressure is applied, the portion 19', corresponding. to the connecting portion 19 of Fig. 4, will be forced into the annular recess made by forming-the bead 20, bending the said portion into transversely semi-circular form, the extreme end portion of the side wall being crowded in between the folds of the portion 19', so that the stock will be solidly compacted therein and c'ohesively engaged with the surface of the bottom of the recess.

A practically solid rib is thus formed in the peripheral portion of the bottom which is continuous with the rib formed from the folds of the side wall and flange, so that forces tending to cause separation of the bottom from the side wall, at the periphery of the bottom, will be effectively resisted by the peripheral rib in the bottom, while the positive interlockin of the bottom with the connecting rib wil enable the latter to resist this action more effectively.

While the above described forms of containers embodying my invention have been herein described as made of uncalendered paper stock, I wish it to be clearly under- I stood that my invention is in no way limited cohesion of the contacting surfaces is not essential, with the above described construction, to satisfactory results. That is, the results secured, due to the construction, even when highly calendered stock is employed, are

satisfactory and suflicient for most, if not all, practical purposes, although the formation is not as perfect as when uncalendered stock is employed. Under some conditions,

, cap-retaining calendered stock is the more desirable, particularly if the stock is not to be waterproofed. with paraflin or like substances.

Moreover, as previously indicated, the formation of shar bends in the stock breaks up its calendere surface, so that it will cohere with another surface to a better advantage, and in the case of the end wall flange, which is increasingly solidified from base to edge, the bending causes a partial return to normal or slight increase in thickness, as well as a breaking up of the calendered surface, so that the flange is more effectively anchored between the folds of the side wall.

I claim 1. In a paper container, a side wall having a reinforced neck formed from a continuation of the stock thereof, and comprising an outer fold, an inner fold, a rim portion connecting said folds, and two intervening folds, one of which extends from the inner end of the inner fold to the rim portion, in contact with the inner fold, and the other of which extends reversely from the rim portion, in contact with the outer fold, said folds being pressed together into a solid, practically homogeneous mass and moulded to provide I a cap-retaining groove.

2. In a paper container, a side wall having a reinforced neck formed from a continuation of the stock thereof, and comprising an outer fold, an imier fold, a rim portion connecting said fold, and two intervening folds, one of which extends from the inner end of the inner fold to the rimportion in contact with the inner fold, and the other of which extends reversely from the rim ortion in contact with the outer fold, said olds being pressed together into a solid, ractically homogeneous mass and moulde to provide a roove, and the connecting bent portion 0 said inner fold and the adjacent intervening fold having its surface continuous with the inner surface of the side wall.

3. In a paper container, a side-wall having a reinforced neck formed from a continnation of the stock thereof, and comprising an outer and an inner fold having a connecting rim portion and two inter-disposed folds, the innermost thereof extendin reversely from the inner fold, 'at the 1nner surface of the side-wall, to said rim-portion, the outermost extending reversely from the rim-portion to a point short of said inner surface and the surface portion of the innermost from the end of the outermost to said surface being engaged with the outer fold, the adjacent surfaces of all of said folds being pressed together into intimate surface contact and said folds being moulded to form a cap-supporting seat.

4. In a paper container, a paper side-wall,

a paper end-wall therefor having an outwardly turned flange portion formed with an inwardly folded, reversely extended terminal portion of abbreviated length, a continuation of said side-wall being arranged on the outside and inside surfaces of said I flange. and terminal portions, with an intermediate ledge engaged with the end of said terminal portion andv extended beyond the ledge to the end wall and in contact there with to the inner side of the flange portion,

the end portion of said continuation being reversely folded to provide a double thickness of the stock thereof between the flange and terminal portions and a triple thickness thereof within the flange portion and between the end of the terminal portion and the end wall, said folds being pressed into intimate surface contact with each other to form a solid rib.

5. In a paper container a aper side wall,

a paper end wall there or liaving an outwardly turned flange portion formed with an inwardly folded terminal portion extended reversely for a portion of the length of the flanged portion, said side wall having a continuation thereof on the outside and inside surfaces of the flange and terminal portions, and having its end-portion extended reversely at the end-wall and at the bend between said flange and terminal portions, to form a double thickness of the stock of said continuation between said flange and terminal portions and a triple thickness thereof within said flange portion and between the end of its terminal and the end wall, said folds being pressed together into intimate surface contact to form a solidmass.

6. In a paper container, a paper side wall, a paper end wall therefor having an inwardly extending bead and a complemental ex-. ternal recess moulded therein, the stock forming the outer side of said bead being continued in contact with the side-wall, forming a flange portion and being inwardly folded and extended reversely, forming a terminal portion, and a continuation of theside wall being inwardly folded about said terminal portion and extended transversely of the recess in contact with the bottom thereof, and bent reversely therein the end portion thereof beyond the bead being reversely folded between the flange and terminal portions and said folds being transversely compressed into intimate surface contact, to form a solid connecting rib, and longitudinally compressed against the bottom of said recess.

7. In a pa er container, a paper side-wall, a paper en .wall therefor having an inwardly extending bead and a complemental external recess, semi-circularly curved transversely, and extended, in continuation of 1ts outermost portion, in contact with the side-wall, forming a flange portion and inwardly folded and reversely extended, forming a terminal portion, and a continuation of the side-wall being inwardly folded about said terminal portion and extended into con tact with the bottom of said recess from the inner to the outer side thereof, forming a semi-circularly bent portion therein, the end portion thereof being extended in contact with the inner side of the flange portion and reversely folded between the same and said terminal portion, the several contacting folds being transversely and longitudinally compressed to form the same into a solid mass and cause intimate surface contact therebetween and between the bottom surface of said recess and the portion of the side-wall disposed therein.

8. In a paper container, apaper side wall, a paper end wall therefor having an 1 inwardly extending bead and a complemental external recess, semi-circularly curved transversely and extended, in continuation of its outermost portion, in contact with the side wall, forming a flange portion and inwardly folded and reversely extended for aportion of the length of said flange portion, forming a terminal portion, and a continuation of the side wall being inwardly folded about said terminal portion and having an intermediate shoulder engaged with the end thereof, said continuation being extended from said shoulder into engagement with the bottom of said recess, at its outer side, and semi-circularly bent in contact therewith, the end portion of said continuation being formed in a two-ply fold having its bend disposed at-the bend between said flange and terminalportions and its end engaged with its semi-circularly bent portion at the middle thereof, said-folds being compressed into intimate surface contact with each other and said semi-circularly bent portion with the bottom of said recess.

9. In a paper container, a paper side wall,

a paper end wall therefor having an inwardly extending bead and a complemental external recess moulded therein, the stock forming the outer side'of said bead being continued in contact with the side wall forming a flange portion, a continuation of'the side wall being folded about said flange-and bent double, andthe doubled portion. atthe bend being pressed into said recess in intimate surface contact with the outer surface of the portion of the end wall within the recess.

l0.- In apaper container, a paper side wall,

a paper end wall therefor having an inwardly extending bead and a complemental external recess moulded therein, the stock forming the outer side of said head being continued in contact with the side wall, and

continuations thereoflbeing-inwardly folded together, the folded parts being compressed mto elongated parallel folds in intimate parallel surface/ contact with each other to form a solid connecting rib. and a portion of the side wall continuation being folded about the edge of the end wall continuation and compressed into said recess in intimate surface contact with the outer surface of the portion of the end wall within the recess.

11. In a paper container, a paper side wall, a paper end wall therefor having an in- Wardly extending bead and a complemental external recess moulded therein, the stock forming the outer side of said head being continued in contact with the side wall, and continuations thereof bein inwardly folded together, the folded parts%)eing compressed into elongated parallel folds with their adjacent faces in intimate surface contact with each other to form a solid connecting rib, and a double fold of the side wall continuation being pressed about the edge of the end wall continuation and into said recess in intimate surface contact with the outer surface of the endiwall.

12. In a paper container, a paper sidewall, a paper end wall therefor having an inwardly extending bead and a complemental external recess, semi-circularly curved transversely, and extended in continuation of its outermost portion, in contact with a continuation of the slde wall, said continuations being inwardly folded together and pressed into intimate surface contact with each other to form a solid connecting rib, and said side wall continuation being extended between the end wall and the edge of its continuation and having its end portion doubled and pressed into intimate surface contact with the outer surface of the end wall within the said recess, all of the folded parts being compressed together with elongated parallel folds.

13. In a paper container, a paper side wall, apaper end-wall therefor having an inwardly extending bead and a complemental external recess, semi-circularly curved transversely, and extended, in continuation of its outermost portion in contact with a continuation of the side wall, said side-wall continua-' tion being inwardly folded about the end wall extension, and having an intermediate fold formed therein, into the middle of which its extreme end is inserted, said fold being pressed into said recess so that the convex surface of the fold is'held in intimate contact with the bottom surface of the recess and the folded portions disposed therein are pressed into a solid mass.

In testimony whereof I afiix my signature.

ARLINGTON MOORE. 

